Setting Loop Range for Animated GIF

Hi there,

I have a 150 frame sequence, but want to export only about 15 frames for a looping animated gif. I've tried several approaches including:

1. setting the loop area to my desired range
2. naming the first keyframe of my desired loop as "#First" and adding a keyframe at the end of my loop named "#Last".

Every time I go to export the gif, the range seems to start wherever the play head is located until the end of the whole scene.

Any ideas? Thanks much for your time!